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AUSCERT External Security Bulletin Redistribution
ESB-2020.0947
USN-4301-1: Linux kernel vulnerabilities
18 March 2020
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AusCERT Security Bulletin Summary
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Product: kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-2732 CVE-2019-19068 CVE-2019-19066
CVE-2019-19059 CVE-2019-19058 CVE-2019-19056
CVE-2019-19053 CVE-2019-3016
Reference: ESB-2020.0945
ESB-2020.0141
ESB-2019.4772
ESB-2019.4704
Original Bulletin:
https://usn.ubuntu.com/4301-1/
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USN-4301-1: Linux kernel vulnerabilities
16 March 2020
linux-aws-5.0, linux-gcp, linux-gke-5.0, linux-oracle-5.0 vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 18.04 LTS
Summary
Several security issues were fixed in the Linux kernel.
Software Description
o linux-aws-5.0 - Linux kernel for Amazon Web Services (AWS) systems
o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
o linux-gke-5.0 - Linux kernel for Google Container Engine (GKE) systems
o linux-oracle-5.0 - Linux kernel for Oracle Cloud systems
Details
It was discovered that the KVM implementation in the Linux kernel, when
paravirtual TLB flushes are enabled in guests, the hypervisor in some
situations could miss deferred TLB flushes or otherwise mishandle them. An
attacker in a guest VM could use this to expose sensitive information (read
memory from another guest VM). (CVE-2019-3016)
Paulo Bonzini discovered that the KVM hypervisor implementation in the Linux
kernel could improperly let a nested (level 2) guest access the resources of a
parent (level 1) guest in certain situations. An attacker could use this to
expose sensitive information. (CVE-2020-2732)
It was discovered that the RPMSG character device interface in the Linux kernel
did not properly deallocate memory in certain error conditions. A local
attacker could possibly use this to cause a denial of service (kernel memory
exhaustion). (CVE-2019-19053)
It was discovered that the Marvell Wi-Fi device driver in the Linux kernel did
not properly deallocate memory in certain error conditions. A local attacker
could use this to possibly cause a denial of service (kernel memory
exhaustion). (CVE-2019-19056)
It was discovered that the Intel Wi-Fi device driver in the Linux kernel device
driver in the Linux kernel did not properly deallocate memory in certain error
conditions. A local attacker could possibly use this to cause a denial of
service (kernel memory exhaustion). (CVE-2019-19058, CVE-2019-19059)
It was discovered that the Brocade BFA Fibre Channel device driver in the Linux
kernel did not properly deallocate memory in certain error conditions. A local
attacker could possibly use this to cause a denial of service (kernel memory
exhaustion). (CVE-2019-19066)
It was discovered that the Realtek RTL8xxx USB Wi-Fi device driver in the Linux
kernel did not properly deallocate memory in certain error conditions. A local
attacker could possibly use this to cause a denial of service (kernel memory
exhaustion). (CVE-2019-19068)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 18.04 LTS
linux-image-5.0.0-1013-oracle - 5.0.0-1013.18
linux-image-5.0.0-1027-aws - 5.0.0-1027.30
linux-image-5.0.0-1032-gke - 5.0.0-1032.33
linux-image-5.0.0-1033-gcp - 5.0.0-1033.34
linux-image-aws-edge - 5.0.0.1027.41
linux-image-gcp - 5.0.0.1033.37
linux-image-gke-5.0 - 5.0.0.1032.20
linux-image-oracle - 5.0.0.1013.13
To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades .
After a standard system update you need to reboot your computer to make all the
necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have been given
a new version number, which requires you to recompile and reinstall all third
party kernel modules you might have installed. Unless you manually uninstalled
the standard kernel metapackages (e.g. linux-generic,
linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system
upgrade will automatically perform this as well.
References
o CVE-2019-19053
o CVE-2019-19056
o CVE-2019-19058
o CVE-2019-19059
o CVE-2019-19066
o CVE-2019-19068
o CVE-2019-3016
o CVE-2020-2732
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